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Diffstat (limited to 'docs/build/unreleased/884.rst')
| -rw-r--r-- | docs/build/unreleased/884.rst | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/docs/build/unreleased/884.rst b/docs/build/unreleased/884.rst new file mode 100644 index 0000000..d357d99 --- /dev/null +++ b/docs/build/unreleased/884.rst @@ -0,0 +1,24 @@ +.. change:: + :tags: usecase, batch + :tickets: 884 + + Named CHECK constraints are now supported by batch mode, and will + automatically be part of the recreated table assuming they are named. They + also can be explicitly dropped using ``op.drop_constraint()``. For + "unnamed" CHECK constraints, these are still skipped as they cannot be + distinguished from the CHECK constraints that are generated by the + ``Boolean`` and ``Enum`` datatypes. + + Note that this change may require adjustments to migrations that drop or + rename columns which feature an associated named check constraint, such + that an additional ``op.drop_constraint()`` directive should be added for + that named constraint as there will no longer be an associated column + for it; for the ``Boolean`` and ``Enum`` datatypes, an ``existing_type`` + keyword may be passed to ``BatchOperations.drop_constraint`` as well. + + .. seealso:: + + :ref:`batch_schematype_constraints` + + :ref:`batch_check_constraints` + |